[
https://issues.apache.org/jira/browse/LUCENE-9191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17094921#comment-17094921
]
Chris M. Hostetter edited comment on LUCENE-9191 at 4/28/20, 11:21 PM:
-----------------------------------------------------------------------
Apache jenkins found some reproducing failures originating from
{{BasePostingsFormatTestCase.testInvertedWrite}} that seem suspiciuosly related
to this issue.
The seeds alone don't seem to reproduce for me, but i didn't try downloading &
using the same
{{tests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt}}
used by jenkins...
https://builds.apache.org/view/L/view/Lucene/job/Lucene-Solr-NightlyTests-master/2170/
{noformat}
> git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> git config remote.origin.url
> https://gitbox.apache.org/repos/asf/lucene-solr.git # timeout=10
Fetching upstream changes from
https://gitbox.apache.org/repos/asf/lucene-solr.git
> git --version # timeout=10
> git fetch --tags --progress
> https://gitbox.apache.org/repos/asf/lucene-solr.git
> +refs/heads/*:refs/remotes/origin/*
> git rev-parse refs/remotes/origin/master^{commit} # timeout=10
> git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision e0c06ee6a6db925efa40b6633869c800d5745261
(refs/remotes/origin/master)
> git config core.sparsecheckout # timeout=10
> git checkout -f e0c06ee6a6db925efa40b6633869c800d5745261
Commit message: "LUCENE-9191: make LineFileDocs random seeking more efficient
by recording safe skip points in the concatenated gzip'd chunks"
> git rev-list --no-walk c94770c2b9c00ccdc2d617d595d62f85a332dc0c # timeout=10
Cleaning workspace
> git rev-parse --verify HEAD # timeout=10
Resetting working tree
> git reset --hard # timeout=10
> git clean -fdx # timeout=10
Cleaning up
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data
Updating http://svn.apache.org/repos/asf/lucene/test-data at revision
'2020-04-22T04:32:15.464 +0000'
At revision 1876810
No emails were triggered.
[checkout] $ /home/jenkins/tools/ant/apache-ant-1.8.4/bin/ant -file build.xml
-Dtests.multiplier=2
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data
/enwiki.random.lines.txt jenkins-nightly
Buildfile:
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/checkout/build.xml
jenkins-nightly:
-print-java-info:
[java-info] java version "11.0.4"
[java-info] Java(TM) SE Runtime Environment (11.0.4+10-LTS, Oracle Corporation)
[java-info] Java HotSpot(TM) 64-Bit Server VM (11.0.4+10-LTS, Oracle
Corporation)
[java-info] Test args: [-XX:TieredStopAtLevel=1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running 'ant
get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestDirectPostingsFormat -Dtests.method=testInvertedWrite
-Dtests.seed=172C6414BE5E2A2C -Dtests.multiplier=2 -Dtests.nightly=true
-Dtests.s
low=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=shi-Tfng-MA -Dtests.timezone=SystemV/MST7 -Dtests.
asserts=true -Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.03s J2 | TestDirectPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running 'ant
get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestBloomPostingsFormat -Dtests.method=testInvertedWrite
-Dtests.seed=172C6414BE5E2A2C -Dtests.multiplier=2 -Dtests.nightly=true
-Dtests.slow=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=vai-Vaii -Dtests.timezone=SystemV/HST10 -Dtests.asserts=true
-Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.01s J1 | TestBloomPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running
'ant get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestVarGapDocFreqIntervalPostingsFormat
-Dtests.method=testInvertedWrite -Dtests.seed=172C6414BE5E2A2C
-Dtests.multiplier=2 -Dtests.nightly=true -Dtests.slow=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=uz-Cyrl-UZ -Dtests.timezone=America/Maceio -Dtests.asserts=true
-Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.01s J1 |
TestVarGapDocFreqIntervalPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_2]
...
etc...
{noformat}
Repro build found all of these seeds reproduce reliably on jenkins...
https://builds.apache.org/view/L/view/Lucene/job/Lucene-Solr-repro-Java11/1042/
was (Author: hossman):
Apache jenkins found some reproducing failures originating from
{{BasePostingsFormatTestCase.testInvertedWrite}} that seem suspiciuosly related
to this issue.
The seeds alone don't seem to reproduce for me, but i didn't try downloading &
using the same
{{tests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt}}
used by jenkins...
https://builds.apache.org/view/L/view/Lucene/job/Lucene-Solr-NightlyTests-master/2170/
{noformat}
> git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> git config remote.origin.url
> https://gitbox.apache.org/repos/asf/lucene-solr.git # timeout=10
Fetching upstream changes from
https://gitbox.apache.org/repos/asf/lucene-solr.git
> git --version # timeout=10
> git fetch --tags --progress
> https://gitbox.apache.org/repos/asf/lucene-solr.git
> +refs/heads/*:refs/remotes/origin/*
> git rev-parse refs/remotes/origin/master^{commit} # timeout=10
> git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision e0c06ee6a6db925efa40b6633869c800d5745261
(refs/remotes/origin/master)
> git config core.sparsecheckout # timeout=10
> git checkout -f e0c06ee6a6db925efa40b6633869c800d5745261
Commit message: "LUCENE-9191: make LineFileDocs random seeking more efficient
by recording safe skip points in the concatenated gzip'd chunks"
> git rev-list --no-walk c94770c2b9c00ccdc2d617d595d62f85a332dc0c # timeout=10
Cleaning workspace
> git rev-parse --verify HEAD # timeout=10
Resetting working tree
> git reset --hard # timeout=10
> git clean -fdx # timeout=10
Cleaning up
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data
Updating http://svn.apache.org/repos/asf/lucene/test-data at revision
'2020-04-22T04:32:15.464 +0000'
At revision 1876810
No emails were triggered.
[checkout] $ /home/jenkins/tools/ant/apache-ant-1.8.4/bin/ant -file build.xml
-Dtests.multiplier=2
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data
/enwiki.random.lines.txt jenkins-nightly
Buildfile:
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/checkout/build.xml
jenkins-nightly:
-print-java-info:
[java-info] java version "11.0.4"
[java-info] Java(TM) SE Runtime Environment (11.0.4+10-LTS, Oracle Corporation)
[java-info] Java HotSpot(TM) 64-Bit Server VM (11.0.4+10-LTS, Oracle
Corporation)
[java-info] Test args: [-XX:TieredStopAtLevel=1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running 'ant
get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestDirectPostingsFormat -Dtests.method=testInvertedWrite
-Dtests.seed=172C6414BE5E2A2C -Dtests.multiplier=2 -Dtests.nightly=true
-Dtests.s
low=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=shi-Tfng-MA -Dtests.timezone=SystemV/MST7 -Dtests.
asserts=true -Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.03s J2 | TestDirectPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running 'ant
get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestBloomPostingsFormat -Dtests.method=testInvertedWrite
-Dtests.seed=172C6414BE5E2A2C -Dtests.multiplier=2 -Dtests.nightly=true
-Dtests.slow=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=vai-Vaii -Dtests.timezone=SystemV/HST10 -Dtests.asserts=true
-Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.01s J1 | TestBloomPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_1]
...
[junit4] 2> NOTE: download the large Jenkins line-docs file by running
'ant get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test
-Dtestcase=TestVarGapDocFreqIntervalPostingsFormat
-Dtests.method=testInvertedWrite -Dtests.seed=172C6414BE5E2A2C
-Dtests.multiplier=2 -Dtests.nightly=true -Dtests.slow=true
-Dtests.linedocsfile=/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-master/test-data/enwiki.random.lines.txt
-Dtests.locale=uz-Cyrl-UZ -Dtests.timezone=America/Maceio -Dtests.asserts=true
-Dtests.file.encoding=US-ASCII
[junit4] ERROR 0.01s J1 |
TestVarGapDocFreqIntervalPostingsFormat.testInvertedWrite <<<
[junit4] > Throwable #1: java.nio.charset.MalformedInputException: Input
length = 1
[junit4] > at
__randomizedtesting.SeedInfo.seed([172C6414BE5E2A2C:E5829DFC005A1F0]:0)
[junit4] > at
java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
[junit4] > at
java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
[junit4] > at
java.base/java.io.InputStreamReader.read(InputStreamReader.java:185)
[junit4] > at
java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:326)
[junit4] > at
java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)
[junit4] > at
org.apache.lucene.util.LineFileDocs.open(LineFileDocs.java:175)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:65)
[junit4] > at
org.apache.lucene.util.LineFileDocs.<init>(LineFileDocs.java:69)
[junit4] > at
org.apache.lucene.index.BasePostingsFormatTestCase.testInvertedWrite(BasePostingsFormatTestCase.java:540)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit4] > at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[junit4] > at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[junit4] > at
java.base/java.lang.reflect.Method.invoke(Method.java:566)
[junit4] > at java.base/java.lang.Thread.run(Thread.java:834)
[junit4] 1> [_0.cfe, _0.cfs, _0.si, segments_2]
...
etc...
{noformat}
> Fix linefiledocs compression or replace in tests
> ------------------------------------------------
>
> Key: LUCENE-9191
> URL: https://issues.apache.org/jira/browse/LUCENE-9191
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Assignee: Michael McCandless
> Priority: Major
> Fix For: 8.6
>
> Attachments: LUCENE-9191.patch, LUCENE-9191.patch
>
>
> LineFileDocs(random) is very slow, even to open. It does a very slow "random
> skip" through a gzip compressed file.
> For the analyzers tests, in LUCENE-9186 I simply removed its usage, since
> TestUtil.randomAnalysisString is superior, and fast. But we should address
> other tests using it, since LineFileDocs(random) is slow!
> I think it is also the case that every lucene test has probably tested every
> LineFileDocs line many times now, whereas randomAnalysisString will invent
> new ones.
> Alternatively, we could "fix" LineFileDocs(random), e.g. special compression
> options (in blocks)... deflate supports such stuff. But it would make it even
> hairier than it is now.
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